US6586512B1ExpiredUtilityPatentIndex 72

Binding superabsorbent polymers to substrates

Assignee: DOW CHEMICAL COPriority: Sep 30, 1999Filed: Sep 28, 2000Granted: Jul 1, 2003

Est. expirySep 30, 2019(expired)· nominal 20-yr term from priority

Inventors:DUKES CHARLES D SHAFFER DONNA G

C08G 59/50C08L 71/00C08G 59/66C08G 59/444C08L 2666/04C08G 2650/56C09J 171/00A61L 15/60C08G 59/621A61L 15/26C08G 59/4064

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Claims

Abstract

A composition comprising a superabsorbent polymer and a hydroxy-functionalized polyether.

Claims

exact text as granted — not AI-modified

What is claimed is:

1. A composition comprising: (a) a superabsorbent polymer comprising at least one polytnaized monomer selected from the group consisting of a carboxylic acid, acrylamide, or derivatives thereof, and (b) a binding amount of a hydroxy-functionalized polyeher.

2. The composition of claim 1 wherein the hydroxy-functionalized polyether has a multimodal molecular weight distribution or is a mixture of two or more hydroxy-functionalized polyethers having different molecular weights.

3. The composition of claim 1 wherein the hydroxy-functionalized polyether is a poly(hydroxy ether) having repeating units represented by the formula:
wherein B is a divalent organic moiety which is predominantly hydrocarbylene, each R independently is alkyl or hydrogen, and n is an integer from 5 to 1000.

4. The composition of claim 3 wherein the hydroxy-functionalized polyether is prepared by the reaction of a diglycidylether or epihalohydrin with a bisphenol.

5. The composition of claim 1 wherein the hydroxy-functionalized polyether is a poly(hydroxy amino ether) having repeating units represented by the formula:
wherein A is a diamino moiety or a combination of different amine moieties; B is a divalent organic moiety which is predominantly hydrocarbylene; each R independently is alkyl or hydrogen; and n is an integer from 5 to 1000.

6. The composition of claim 5 wherein the hydroxy-functionalized polyether is prepared by the reaction of a diglycidyl ether with a difunctional amine.

7. The composition of claim 1 wherein the hydroxy-functionalized polyether is a poly(hydroxy ether sulfonamide) having repeating units represented by any one of the formulas:
wherein each R independently is hydrogen or alkyl, R 1 and R 3 are independently a substituted or an unsubstituted alkyl or aryl wherein the substituent(s) is a monovalent moiety which is inert in the reactions used to prepare the hydroxy-functionalized polyether; B and R 2 are independently a divalent organic moiety which is predominantly hydrocarbylene, and n is an integer from 5 to 1000.

8. The composition of claim 7 wherein the hydroxy-functionalized polyether is prepared by the reaction of a diglycidyl ether and a difunctional sulfonamide.

9. The composition of claim 1 wherein the hydroxy-functionalized polyether is a poly(hydroxy-ether sulfide) that has repeating units represented by the formula:
wherein each R independentlyis hydrogen or alkyl, R 4 and B are independently a divalent organic moiety which is predominantly hydrocarbylene and n is an integer from 5 to 1000.

10. The composition of claim 9 wherein the hydroxy-functionalized polyether is prepared by the reaction of a diglycidyl ether and a dithiol.

11. The composition of claim 1 wherein the hydroxy-functionalized polyether is a poly(hydroxy amide ether) having repeating units represented independently by any one of the formulas:
a poly(hydroxy amide ether) having repeating units represented by any one of the formulas:
wherein each R independently is hydrogen or alkyl, R 2 and Ar are independently a divalent organic moiety which is predominantly hydrocarbylene, and n is an integer from 5 to 1000.

12. The composition of claim 1 wherein the polyether is employed as part of a hot melt adhesive composition, optionally comprising a compatible tackifier, a compatible plasticizer and a compatible diluent.

13. The composition of claim 12 wherein the tackifier is a terpene phenolic resin or a benzoate or a mixture thereof in an amount of from 0 to 90 percent by weight.

14. The composition of claim 12 wherein the plasticizer is a phthalate plasticizer, benzoate plasticizer, a liquid polyester, a phosphate plasticizer, a polyalkylene glycol, a vegetable oil, or an animal oil in an amount of from 0 to 90 percent by weight.

15. The composition of claim 12 wherein the diluent is a wax in an amount of from 0 to 50 percent by weight.

16. The composition of claim 15 wherein the wax is N-(2-hydroxyethyl)-12-hydroxystearamanide wax, hydrogenated castor oil or an oxidized synthetic wax.

17. The composition of claim 1 wherein component (b) is present in an amount of from 0.01 to 20 weight percent based on the weight of the composition.

18. The composition of claim 17 wherein component (b) is present in an amount of from 0.15 percent to 4 percent.

19. The composition of claim 17 wherein component (b) is present in an amount of from 0.25 percent to 2 percent.

20. The composition of claim 1 wherein the hydroxy-functionalized polyether is a poly(hydroxy ester ether) or poly(hydroxy ester) having repeating units represented by the formula:
wherein R 5 is
R 6 is a divalent organic moiety which is predominantly hydrocarbylene or
R 7 is
each R independently is alkyl or hydrogen; each R 2 is independently a divalent organic moiety which is predominantly hydrocarbylene; each R 8 independently is methyl or hydrogen; m and y are each independently from 0 to 100; and n is an integer from 5 to 1000.

21. The composition of claim 1 wherein the polyether is not the reaction product of a dicarboxylic acid with a diglycidyl ether.

22. The composition of claim 1 wherein the polyether is thermoplastic.

23. An absorbent article comprising the composition of claim 1 .

24. The composition of claim 1 further comprising at least one fiber.

25. The composition of claim 1 further comprising a cellulosic material.

26. The composition of claim 1 wherein the hydroxy-functionalized polyether is in particulate form and has a weight average particle diameter of from 10 to 200 microns.

27. The composition of claim 1 wherein the hydroxy-functionalized polyether is in particulate form and has a weight average particle diameter of from 50 to 150 microns.

28. A process comprising contacting a substrate with (a) a superabsorbent polymer comprising at least one polymerized monomer selected from the group consisting of a carboxylic acid, acrylamide, or derivatives thereof, and (b) a binding amount of a hydroxy-functionalizd polyether.

29. The process of claim 28 wherein the substrate comprises a cellulosic material.

30. The process of claim 28 wherein the polyether is thermoplastic.

31. The process of claim 28 wherein the amount of polyether is from 0.01 percent to 20 percent, based on the total weight of polyether and superabsorbent polymer.

32. The process of claim 28 wherein the amount of polyether is from 0.1 percent to about 10 percent, based on the total weight of polyether and superabsorbent polymer.

33. The process of claim 28 wherein the amount of polyether is from 0.25 percent to 2 percent, based on the total weight of polyether and superabsorbent polymer.

34. An absorbent article prepared using the process of claim 28 .

35. The process of claim 28 wherein the polyether is a component of a hot melt adhesive composition which further optionally comprises a compatible tackifier, a compatible plasticizerand a compatible diluent.

36. A process for preparng an absorbent article comprising a superabsorbent polymer and cellulose-containing fluff, the process comprising contacting at least a portion of the fluff with a binding amount of a hydroxy-functionalized polyether and with a superabsorbent polymer, the superabsorbent polymer comprising at least one polymerized monomer selected from the group consisting of a carboxylic acid, acrylamide, or derivatives thereof; in such a manner that an absorbent article is formed.

37. The process of claim 36 wherein an air-laid process is employed.

38. The process of claim 36 wherein a wet-laid process is employed.

39. The composition of claim 1 wherein the superabsorbent polymer comprises polymerized acrylic acid.

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